Designed for the new specification AQA GCSE( covers spec point 4.7.2 ) course but can be modified for other exam boards. 8 slides covering Decomposition: -Describe how methane gas can be produced from decaying materials for use as a fuel -Explain how temperature, water and availability of oxygen affect the rate of decay of biological material -Explain how the conditions for decay are optimised by farmers and gardeners, and the reasons for this -Explain how environmental changes can affect the distribution of species in an ecosystem (temperature, water and atmospheric gases) -Required practical 10: investigate the effect of temperature on the rate of decay of fresh milk by measuring pH change
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